[quote="koolmoedee1000":2b3tgvwr]Galaxy S3 seems to have a really good read even with small tags in this area

The issue with reading tags isn't that they're large or small, but rather that the public and private NFC tags on the ring interfere with each other. The Galaxy S3 has its NFC antenna in the battery like the S4, which supposedly doesn't work very well with normal NFC rings (John said the sweet spot was ~1cm by 1cm). So this rectangle isn't a good representation of how well the rings will work with the S3.

NFC detection area
Nfc detection area on Sony Xperia™ SP
The location of the NFC detection area is not the same on all devices. When sharing data with another device using NFC, refer to the User guide of the other device for more information.

Nokia N9
This phone has excellent NFC readability with a huge sweet spot at the top rear of the phone.
Both Alpha and Normal rings are very easily readable, so easy in fact that I keep doing it by accident.

An awful phone with major screen issues. If you really must have one then the bullseye marks the sweet spot. Best used with inlays horizontal to the phone (stick your finger straight up the back of it).

@paulguy but like it says this is verizon, wut about att sprint and tmobile, cause i can tell u now this is inaccurate for t-mobile its a tad bit higher and further to tha left more towards tha middle of tha phone